[j-nsp] MC-LAG on QFX5100

[Vincent Bernat]

 ❦ 10 juillet 2017 12:36 -0400, William McLendon <wimclend at gmail.com> :

> if you are running a routing protocol over the particular VLAN on the
> MC-LAG peers (which is a supported config in Junos MC-LAG
> implementation) make sure you are running VRRP between the MC-LAG
> peers, even though it seems unnecessary.  VRRP seems required for any
> ARP sync to occur for a given IRB interface.  Without it one side can
> learn the ARP entry but not the other.  Clearing arp cache seems to
> fix it temporarily but then it pops up again after ARP ages out.
>
> We ran into this issue in a similar scenario with MC-LAG L2-only
> switches where you could only ping the default gateway from one node
> unless you issued a clear arp, and then it would work until ARP timer
> ran out again.  Once we configured VRRP that issue was resolved.

Which version do you use? I specifically configured VRRP for this reason
but still ran into ARP problems.
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